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UCC5870-Q1: question about Rpui and Rpdi

Jay wang
Expert 3171 points
Part Number: UCC5870-Q1

hi experts

i have two questions about Rpui and Rpdi.

Q1: do the parameter of Rpui and Rpdi mean the internal resistor in UCC5870?

Q2: whether can some configurations for UCC5870 registers affect these parameters real value?

some engineers find that the falling time of IN+ (from MCU) show different value in different configurations for UCC5870 registers.

  • 0
    TI__Expert 5921 points

    Hi Jay,

    Thanks for reaching out.

    Jay wang said:
    Q1: do the parameter of Rpui and Rpdi mean the internal resistor in UCC5870?

    Yes, these are internal pull up and pulldown resistances on the input pins.

    Jay wang said:
    Q2: whether can some configurations for UCC5870 registers affect these parameters real value?

    The pull up resistance may very from device to device, or across temperature, but there are not settings to change the pullup/pulldown values.

    Could you ask for more specifics on this difference in IN+ falling time that the customer is seeing? Which registers have changed? Do they have waveforms and schematic to share?

    Regards,

    Daniel

  • 0 in reply to Daniel Norwood
    TI__Expert 3171 points

    thanks for your answer.

    i will ask customer to get more detailed info. than if get, I will send to you by e-mail